//
// Created by jsjxsy on 2022/6/30.
//
#include <ctype.h>
#include <stdio.h>
#include <string.h>
int main(void) {
  char *str = "ABC";
  int length = strlen(str);
  for (int i = 0; i < length; ++i) {
    putchar(tolower(str[i]));
  }
  puts("");
  int i=0;
  while(str[i]){
    putchar(tolower(str[i]));
    i++;
  }
  return 0;
}

